Kiefer Sutherland postpones shows due to injury making it 'impossible to sing'

Kiefer Sutherland has had to cancel some concerts due to an injury that left him unable to perform.

The 52-year-old actor, who also sings, shared with his more than 165,000 Instagram followers Thursday that stairs on a bus are to blame.

"Sadly I slipped on the steps of the bus whilst travelling to Denmark and seriously injured a rib, making it difficult to breathe and impossible to sing," the "24" alum wrote in the screenshot shared. "Regretfully, I will not be able to perform the last 3 shows of our tour, but have every intension (sic) of making up these shows up (sic) in September / October when we return.

"I am so sorry for any inconvenience that I have caused to the fans who have bought tickets," he continued. "I will do everything I can to make it up to you."

Sutherland then thanked his fans "for your understanding."

"Make up dates in September to be announced shortly for Denmark and Gothenburg," Sutherland wrote in the post's caption.

USA TODAY has reached out to a rep for Sutherland for further comment.